Puddling-furnace



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P. C. ROBERTS. PUDDLING'PURNAGE. No. 511,162. Patented Dec. 19, 1893,V

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iirirTnn STaTns PATENT @Tirreni FRANK C. ROBERTS, OF PHILADELPHIA, PENNSYLVANIA.

PUDDLING- FU RNACE.

SPECIFICATION forming part of Letters Patent No. 511,162, dated Becember 19, 1893.

Application tiled May 25, 1893. Serial No. 475,450. (No modehl To all whom t mag/concern.-

Be it known that I, FRANK C. ROBERTS, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented or discovered new and useful Improvements in Puddling-Furnaces, of which the following is a specification.

In the accompanying drawings which make part ofthis specification, Figure 1, is a central longitudinal vertical section through a puddliug furnace provided with my flues. Fig. 2, is a section on line of Fig. 1.

The purpose of my invention generally stated is to utilize the air heated in the cooling boxes of a furnace by delivering the same under the grate and upon the hearth near the bridge wall, thus eecting a more efficient. production of combustible gases in the fire chamber and promoting a more active and thorough combustion of the gases passinginto the hearth chamber.

In the accompanying drawings, which make part of this specification, 1 is the front Wall of a puddling furnace, having door 2, in which may be placed an air register 3.

11 is the roof of the furnace and 5, the exit to the stack.

6 is a longitudinal and 7 is a cross grate.

S is the bridge and 9 the ashpit under the grate.

10 is the hearth, having at the front and rear ends cooling boxes 1l, l2, extending transversely across the furnace and opening into the outer air at each end. 13 is the usual chamber under the hearth.

14, 14 are fines in the side Walls of the furnace, as seen clearly in Fig. 2, communicating at their lower ends with the chamber 13, and at their upper ends with an overhead cross flue 15, which by slots a-a communicates with the hearth over orjust in advance of the bridge.

16 is a cross Wall which divides the ashpit from chamber 13, and 18 isa tlueleading from cooling box 11 under the rear grate.

The operation of this puddling furnace is as follows The coal is charged into the furnace delivering it upon the front grate 6, a sharp Vre being maintained on the rear grate 7 the `action of the heat `from the re on the grate 7, partially distills and gasifies the coal on grate 6, the product of combustion from the fire on grate 7 and the gas from the coal on grate 6 passing over the bridge Wall Sinto the hearth chamber l0. By the draft of the stack, air is drawn into the ends of the cooling boxes 11 and 12, where it is heated. The heated air from cooling box 12, passes out of the lower side of said box into chamber 13, under the hearth and thence by sideflues 14e to cross overhead flue l5, from which it is delivered by slots d-a, to the hearth chamber over the bridge Wall, or nearly so, Where it meets the gaseous products coming from the grates 6 and 7, which'burn with an intense and almost smokeless flame. The air has been additionally heated by its passage through the chamber 13 and side flues 14 and 15. The heated air from cooling box 11, passes through ue 18 beneath the rear grate 7, and by its heat materially aids in the production of combustible gases and in securing a high temperat ure in the hearth chamber 10. The grate may be fed with air either through an air register in the door, or by leaving the door slightly ajar, or the door may be sealed and air delivered into the ashpit under pressure to feed the grate.

It should be noted that as the coal on grate 7 becomes consumed, the surface of the coal on grate 6, which has become partially distilled and coked is moved down on grate 7, thus providing the necessary fuel for the latter and exposing a fresh surface of coal for distillation on the former.

The boxes 1l and 12, are shown iu the drawings as straight and rectangular in section, but obviously this is only optional.

It lwill be seen that by my construction the furnace is cooled byexterior air at the critical points, and the heated air not dissipated but utilizedl to promote an active and well nigh complete combustion.

It is obvious that the two gra-tes 6 and 7 need not be made with the grate bars of one at right angles to the grate bars of the other as shown in Fig. 1. The gratos maybe separate and have their grate bars parallel to each other, or one grate only maybe provided with a partition dividing the grate into two sections, or one grate only may be provided, the

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coal for combustion and the coal fordistillaf centrated into two generallysebarate heaps, and thns practically dividing ,the grate into two adjacent sections.

I-do not limit my invention to the number of fines 14 and 15 shown in the drawings.

Having described my invention, I claim- 1. In a paddling furnace, the combination of a tire chamber,agrate dividediuto two ad- Jacent sections, a hearth, a cooling box open to the outer air and located at or near the chimneyend of said hearth and communicating with a chamber under the hearth; said chamber; fines in the side Walls of the furnace connecting said chamber with a cross tine, openings from the same into the furnace, 4a second cooling box openvto the outer air, andlocated at or near the fire chamber end 0f the hearth, and a fiue connecting the same with the ashpit chamber, substantially as described. l y l V 2. In a peddling furnace, the combination ot' a hearth, a cooling box located at or near the inner end of said hearth, and communieating withachamber under the hearth; said chamber; iiuesin the "side 'walls ot' the furnace connecting said chamber with a cross flue over the bridge Wall; said cross flue; openings from the same into the furnace; a second cooling box located at or near the forward end of the hearth, and a flue connect ing the same with the ashpit chamber, substanti'ally as described.

In testimony whereof I have hereunto set my hand this 16th Yday of May, A. 13.1893.

FRANK C. ROBERTS. Vitnesses:

W. M. SHANNON, TRYGOE BAY. 

